The Radio Times has Saturday 11th April announced, but there are still gaps, for Doctor Who;
6.25-7.25 TBA (Doctor Who fits in here nicely)
7.25-8.10 Robin Hood
8.10-9.00 The National Lottery
Now it looks like the BBC are deliberately being awkward regarding announcing Doctor Who, or perhaps the post production is very tight and they are still unsure if it will be ready!